APLpy (the Astronomical Plotting Library in Python) is a Python module aimed at producing publication-quality plots of astronomical imaging data in FITS format. The module uses Matplotlib, a powerful and interactive plotting package. It is capable of creating output files in several graphical formats, including EPS, PDF, PS, PNG, and SVG.

AstroML is a Python module for machine learning and data mining built on numpy, scipy, scikit-learn, matplotlib, and astropy. It contains a growing library of statistical and machine learning routines for analyzing astronomical data in Python, loaders for several open astronomical datasets, and a large suite of examples of analyzing and visualizing astronomical datasets.

AstroMap is an [R] tool to generating sky projection maps for astronomical surveys. This tool allows a user to plot full celestial sky maps of astronomical surveys and objects, for a number of different map projections.

SpecFit is an [R] based package which allows users to display, edit and analyse 1D spectra. A spectrum is uploaded using a user-defined set of paramerters and then be displayed in various ways using multipule options.

The Friendly Virtual Radio Interferometer (VRI) is designed to simulate astronomical observations using linked arrays of radio antennas in a technique called earth rotation aperture synthesis. It focuses on simulating the effect of combining different antenna layouts.

The Interactive LOFAR map provides a detailed overview of the location of the stations which comprise the International LOFAR Telescope (ILT), across the Netherlands and wider Europe. It also offers insight into the current status of individual stations and antennas.

Aladin Lite is a lightweight version of Aladin desktop, running in the browser and geared towards simple visualization of a sky region. It can be easily embedded on any web page and is controllable from a Javascript API.

The Pynterferometer is a graphical interface designed to demonstrated the techniques of radio interferometry used by telescopes like, ALMA, e-Merlin, the JVLA and SKA, in a manner accessible to the general public.

Educational tool developed by SAVE/Point, a collaboration of astronomers andeducators dedicated to developing new, innovative games and educational applications to teach astronomical concepts at all levels.

Explore and download data from MAST using the MAST API or astroquery library. Tutorial created by Ivelina Momcheva (@iva_momcheva). MAST API and astroquery modules developed by Clara Brasseur (@cebrasseur).

Recently, A/Prof Tara Murphy, from the University of Sydney's astro group, gave a talk on "Making the leap: from academic to start-up founder". In 2013, along with a colleague and two PhD students, she started Grok Learning, an online platform that provides computing education for school students, teachers and universities. Check it out!

iObserve is the astronomical app you were waiting for. It is a Mac app (10.9+) that allow you to push the preparation of your observations to a much higher level. It is a 6-years old app, and after more than 4 years as a paid app in the MacAppStore, it is now free.

Recently, astrophysicist Matt Turk (@powersoffour) posted plans for astronomical software in 2017 in his new role as Chair of the Working Group for Astronomical Software in the American Astronomical Society.

The Journal of Open Source Software (JOSS) is an open source developer-friendly journal for research software packages. It's designed to make it as easy as possible to create a software paper for your work.